Data Imputation Calculator

This calculator imputes a missing value from a five-point series (Value 1 through Value 5) using the Mean, Median, or Mode of the four values that remain after the value at Missing Value Position is treated as missing (line 17), then compares that estimate against the real value at that position to report Absolute Error and Percent Error. At the default Missing Value Position of 3, Value 3 plays no role at all in computing Mean, Median, or Mode — it's filtered out of the knownValues array before any of the three statistics run — and instead only appears afterward as Actual Value, the number the estimate gets compared against. Because Missing Value Position and Imputation Method are both small integers, a ±10% nudge from a slider rounds right back to the same value (Math.round(3×0.9)=3, Math.round(3×1.1)=3, line 13), so this calculator's own sensitivity checks can't exercise the position-3-vs-position-1 or mean-vs-median-vs-mode branches — only entering a clearly different whole number changes which value is excluded or which statistic runs.

Value 5 raises the Mean output whenever it's one of the four known values, since Mean is a simple unweighted average of whichever four values aren't excluded. This calculator only offers mean, median, and mode imputation plus a basic linear interpolation shown for comparison — it does not implement K-nearest-neighbors or multiple imputation by chained equations, so results should be read as a basic-methods comparison rather than a full imputation pipeline.